| I recently did this.  based on some TR4s I looked at... the switch does go 
on the right side of the nacelle.  I made a (sorta) D-shaped hole to accept 
it.  You will probably find the switch provided has a flat spot on one side 
of the threaded portion, hence the shape of the hole.
The switch typically provided is not the correct one for a TR4 -- it has a 
black (rather than chrome) stalk and is somewhat angled.  I found that 
mounting it with 'up is off' orientation causes it to angle back from the 
wheel and thus reduces the possibility of accidently flicking it in a turn.
I believe the relay is mounted above the tunnel, along the lower edge of the 
battery box.  There were exact measurements of the location in one of the 
manuals (probably Bentley/factory) for dealers adding OD aftermarket.
Geo
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